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LT8650SHV-1#PBF

Description
DUAL 42V, 5A SYNC BUCK IN BT
Categorysemiconductor    Power management   
File Size2MB,32 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LT8650SHV-1#PBF Overview

DUAL 42V, 5A SYNC BUCK IN BT

LT8650SHV-1#PBF Parametric

Parameter NameAttribute value
Functionstep down
Output configurationjust
Topologystep down
Output typefixed
Number of outputs2
Voltage - Input (minimum)3V
Voltage - input (maximum)42V
Voltage - Output (minimum/fixed)3.3V,5V
Voltage - Output (maximum)-
Current - Output4A
Frequency - Switch300kHz ~ 3MHz
Synchronous rectifiernone
Operating temperature-40°C ~ 150°C(TJ)
Installation typesurface mount
Package/casing32-TFQFN Exposed Pad, 28 Leads
Supplier device packaging32-LQFN (6x4)
FEATURES
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LT8650S
Dual Channel 4A, 42V,
Synchronous Step-Down Silent Switcher 2
with 6.2µA Quiescent Current
DESCRIPTION
The
LT
®
8650S
is a dual step-down regulator that delivers
up to 4A of continuous current from both channels and
supports loads up to 6A from each channel. The LT8650S
features the second generation Silent Switcher architecture
to minimize EMI emissions while delivering high efficiency
at high switching frequencies. This includes integration of
bypass capacitors to optimize high frequency current loops
and make it easy to achieve advertised EMI performance
by eliminating layout sensitivity.
The fast, clean, low-overshoot switching edges enable high
efficiency operation even at high switching frequencies,
leading to a small overall solution size. Peak current mode
control with a 40ns minimum on-time allows high step
down ratios at high switching frequencies.
Burst Mode operation features a 6.2μA quiescent current
resulting in high efficiency at low output currents, forced
continuous mode allows fixed switching frequency opera-
tion over the entire output load range, and spread spectrum
operation can further reduce EMI emissions. External VC
pins allow optimal loop compensation for fast transient
response. The VC pins can also be used for current sharing
and the CLKOUT pin enables synchronizing two LT8650S
chips to generate a 4-phase, 16A supply.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S patents, including 8823345.
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n
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n
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Silent Switcher
®
2 Architecture:
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Ultralow EMI on Any PCB
n
Eliminates PCB Layout Sensitivity
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Internal Bypass Capacitors Reduce Radiated EMI
n
Optional Spread Spectrum Modulation
4A DC from Each Channel Simultaneously
Up to 6A on Either Channel
Ultralow Quiescent Current BurstMode
®
Operation:
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6.2μA I Regulating 12V to 5V
Q
IN
OUT1
and 3.3V
OUT2
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Output Ripple <10mV
P-P
Optional External VC Pin: Fast Transient Response
and Current Sharing (Extra 50µA I
Q
/Channel)
Forced Continuous Mode
High Efficiency at High Frequency
94.6% Efficiency at 2A, 5V
OUT
from 12V
IN
at 2MHz
93.3% Efficiency at 4A, 5V
OUT
from 12V
IN
at 2MHz
Fast Minimum Switch-On Time: 40ns
Wide Input Voltage Range: 3.0V to 42V
Adjustable and Synchronizable: 300kHz to 3MHz
Small 4mm × 6mm 32-Pin LQFN Package
APPLICATIONS
n
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General Purpose Step-Down
Automotive and Industrial Supplies
TYPICAL APPLICATION
5V/4A, 3.3V/4A 2MHz Step-Down Converter
V
IN1
5.4V TO 42V
V
OUT1
5V
4A
4.7µF
1.0µH
47µF
×2
4.7pF
191k
1M
FB1
VCC
10nF
BIAS
RT
15k
f
SW
= 2MHz
VCC
GND SYNC
1µF
8650s TA01a
Efficiency
V
IN2
3.7V TO 42V
V
OUT2
3.3V
47µF 4A
×2
100
95
90
85
EFFICIENCY (%)
80
75
70
65
60
55
50
45
40
0
V
IN1
= V
IN2
= 12V
f
SW
= 2MHz
1
2
3
4
LOAD CURRENT (A)
CH1 5V
CH2 3.3V
5
6
V
IN1
EN/UV1
SW1
V
IN2
EN/UV2
SW2
1.0µH
4.7µF
1M
LT8650S
FB2
VC2
SS2
10nF
VCC
316k
4.7pF
VC1
SS1
8650s TA01b
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Rev A

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Description DUAL 42V, 5A SYNC BUCK IN BT IC REG BUCK DL 42V 5A SYNC 32LGA IC REG BUCK DL 42V 5A SYNC 32LGA
Function step down step down step down
Output configuration just just just
Topology step down step down step down
Output type fixed fixed fixed
Number of outputs 2 2 2
Voltage - Input (minimum) 3V 3V 3V
Voltage - input (maximum) 42V 42V 42V
Voltage - Output (minimum/fixed) 3.3V,5V 3.3V,5V 3.3V,5V
Current - Output 4A 4A 4A
Frequency - Switch 300kHz ~ 3MHz 300kHz ~ 3MHz 300kHz ~ 3MHz
Synchronous rectifier none none none
Operating temperature -40°C ~ 150°C(TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ)
Installation type surface mount surface mount surface mount
Package/casing 32-TFQFN Exposed Pad, 28 Leads 32-TFQFN Exposed Pad, 28 Leads 32-TFQFN Exposed Pad, 28 Leads
Supplier device packaging 32-LQFN (6x4) 32-LQFN (6x4) 32-LQFN (6x4)
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